scholarly journals Re-evaluation of the taxonomic and systematic status of “Halitherium” antillense Matthew, 1916 (Mammalia, Sirenia)

PalZ ◽  
2020 ◽  
Author(s):  
Manja Voss
Keyword(s):  
Puerto Rico ◽  
Species Complex ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Late Oligocene ◽  
Single Specimen ◽  
Systematic Status ◽  
Nomen Dubium

Abstract Halitherium antillense Matthew, 1916 was established on a left mandibular fragment and two vertebrae from late Oligocene deposits of Puerto Rico. This species was only provisionally referred to the genus Halitherium and its taxonomic status and systematic affinities remained doubtful. In the course of the revision of the Halitherium-species complex and the meanwhile invalid generic name “Halitherium”, the holotype, and only known specimen, is re-investigated. A number of morphological characters usually diagnostic in sirenians are determined. However, the holotype material of “H.” antillense is not informative enough and, as such, neither can be assigned to any known species nor is it possible to define a taxon that can be clearly distinguished from other species. Unlike other, now revised species originally grouped under “Halitherium”, the establishment of a new taxonomic combination for “H.” antillense is not possible. As a nomenclatural consequence, the name “H.” antillense is only applicable to a single specimen, the holotype, and declared as a nomen dubium.

Systematics of Eutropis rugifera (Stoliczka, 1870) (Squamata: Scincidae) including the redescription of the holotype

Zootaxa ◽  
2017 ◽  
Vol 4272 (1) ◽  
pp. 103 ◽  
Author(s):  
A.A. THASUN AMARASINGHE ◽  
NIKOLAY A. POYARKOV JR. ◽  
PATRICK D. CAMPBELL ◽  
SANDY LEO ◽  
JATNA SUPRIATNA ◽  
...  
Keyword(s):  
Species Complex ◽  
Taxonomic Status ◽  
The Philippines ◽  
Peninsular Malaysia ◽  
Nicobar Island ◽  
Single Specimen ◽  
Morphological Examination ◽  
Widespread Species ◽  
Voucher Specimens ◽  
Biogeographic Regions

Eutropis rugifera has long been identified as a widespread species complex distributed in Nicobar, Peninsular Malaysia, Greater Sundaic Islands, Bali, Sulawesi and the Philippines. This skink was described by Stoliczka in 1870 from Nicobar Island based on a single specimen (holotype by monotypy). Later, Peters (1871), Bartlett (1895) and Werner (1896) described three more species which were morphologically similar to Euprepes percarinatus (from Java), Mabuia rubricollis (Borneo) and M. quinquecarinata (Sumatra) respectively, which are currently considered junior objective synonyms of Eutropis rugifera. We examined all the available synonym types and voucher specimens of Eutropis rugifera deposited at several museums. A morphological examination of the types of this species and mtDNA analysis (584 bp of 16S rRNA) of the samples from different biogeographic regions revealed that Eutropis rugifera from Nicobar Island, Bali Island, and Bawean Island are composed of a monophyletic species. However, the taxonomic status of the above population requires further clarification, and the population in Bawean Island may represent a cryptic species. Finally, we provide a complete redescription of E. rugifera based on its holotype.

scholarly journals Species or population? Systematic status of Vieja coatlicue (Teleostei: Cichlidae)

2019 ◽  
Vol 17 (2) ◽  
Author(s):  
Caleb D. McMahan ◽  
Wilfredo A. Matamoros ◽  
Diego J. Elías ◽  
Kyle R. Piller
Keyword(s):  
Genetic Variability ◽  
Morphological Character ◽  
Taxonomic Status ◽  
Genetic Data ◽  
Distinct Species ◽  
Morphological Characters ◽  
Morphological Data ◽  
Cichlid Species ◽  
Systematic Status ◽  
Isthmus Of Tehuantepec

ABSTRACT Pacific and Atlantic-slope rivers of the Isthmus of Tehuantepec in Mexico contain two cichlid species of the genus Vieja relevant to the current study, V. zonata and V. coatlicue, respectively. The Atlantic-slope species was initially considered a population of uncertain taxonomic status and recently described as a distinct species based on three putatively diagnostic morphological characters. The objective of this study was to combine new and existing genetic data, along with reanalysis of morphological characters, to test the distinctiveness of V. coatlicue. Little genetic variability and no geographic structuring were recovered. Additionally, putatively diagnostic morphological character states were present across both species, failing to separate the forms. The synthesis of molecular and morphological data supports the recognition of V. coatlicue as a junior synonym of V. zonata.

A new species of crayfish in the genus Orconectes (Decapoda: Cambaridae) from the Tennessee River Drainage with comments on and key to members of the O. juvenilis Species Complex

Zootaxa ◽  
2016 ◽  
Vol 4208 (2) ◽  
pp. 161 ◽  
Author(s):  
CHRISTOPHER A. TAYLOR ◽  
CODY M. RHODEN ◽  
GUENTER A. SCHUSTER
Keyword(s):  
United States ◽  
New Species ◽  
Species Complex ◽  
Taxonomic Status ◽  
The United States ◽  
Morphological Characters ◽  
River Drainage ◽  
Tennessee River ◽  
Eastern Highlands ◽  
A New Species

The crayfish subgenus Procericambarus (genus Orconectes) found in the Eastern Highlands of the United States represents a rich assemblage of stream-dwelling macroinvertebrates. While the taxonomic status and distribution of its members were clarified in a previous study, newly diagnosed characters and newly collected specimens warranted a revision to previous hypotheses of Procericambarus membership in the southeastern United States. Using morphological characters, we describe herein a new species of crayfish occurring in the Tennessee River drainage of northern Alabama and southwestern Tennessee. We also provide a revised key for the identification of members of O. juvenilis Species Complex. 

A new species group from the Daphnia curvirostris species complex (Cladocera: Anomopoda) from the eastern Palaearctic: taxonomy, phylogeny and phylogeography

2020 ◽  
Author(s):  
Alexey A Kotov ◽  
Petr G Garibian ◽  
Eugeniya I Bekker ◽  
Derek J Taylor ◽  
Dmitry P Karabanov
Keyword(s):  
New Species ◽  
Species Complex ◽  
Divergence Time ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Species Group ◽  
Morphological Evidence ◽  
Divergence Time Estimates ◽  
Rates Of Evolution ◽  
Daphnia Curvirostris

Abstract The eastern Palaearctic is a centre of diversity for freshwater cladocerans (Crustacea), but little is known about the evolution and taxonomy of this diversity. Daphnia curvirostris is a Holarctic species complex that has most of its diversity in the eastern Palaearctic. We examined the phylogeography, rates of evolution and taxonomic status for each clade of the D. curvirostris complex using morphological and genetic evidence from four genes. The cybertaxonomical and morphological evidence supported an eastern Palaearctic clade, with at least four species (described here as the Daphnia korovchinskyi sp. nov. group) having diagnostic morphological characters. We also detected convergent morphological characters in the D. curvirostris complex that provided information about species boundaries. Two of the new species (Daphnia koreana sp. nov. and Daphnia ishidai sp. nov.) are known from single ponds and are threatened by human activity. Divergence time estimates suggested an ancient origin (12–28 Mya) for the D. korovchinskyi group, but these estimates are complicated by the small number of calibration points.

Redescription of Yphthimoides patricia (Hayward, 1957), with taxonomic notes on the names Euptychia saltuensis Hayward, 1962 and Yphthimoides manasses (C. Felder & R. Felder, 1867) (Nymphalidae: Satyrinae)

Zootaxa ◽  
2018 ◽  
Vol 4422 (4) ◽  
pp. 537
Author(s):  
EDUARDO P. BARBOSA ◽  
RICARDO R. SIEWERT ◽  
OLAF H. H. MIELKE ◽  
GERARDO LAMAS ◽  
KEITH R. WILLMOTT ◽  
...  
Keyword(s):  
Male Genitalia ◽  
Dna Barcode ◽  
Taxonomic Status ◽  
Distinct Species ◽  
Morphological Characters ◽  
Immature Stages ◽  
Adult Morphology ◽  
Nomen Dubium ◽  
New Synonym ◽  
Subjective Synonym

Euptychia saltuensis Hayward, 1962, new synonym, currently regarded as a nomen dubium and possibly a junior subjective synonym of Yphthimoides manasses (C. Felder & R. Felder, 1867), is here treated as a junior subjective synonym of Yphthimoides patricia (Hayward, 1957), based on morphological characters of the male genitalia and the DNA barcode. The taxonomic status of Y. patricia is re-examined, and a detailed redescription of the adult morphology, including the male genitalia, is presented. Information on the distribution, habitat and immature stages of Y. patricia is also provided. Yphthimoides patricia is clearly a distinct species from Y. manasses based on the analysis of DNA barcode sequences and the morphology of the male genitalia.  

Biochemical Systematics, Biogeography and Evolutionary Rates in Species of the Mediterranean Genus Tyrrhenoleuctra (Plecoptera, Leuctridae)

2004 ◽  
Vol 35 (3) ◽  
pp. 299-306 ◽  
Author(s):  
◽  
J. M. Tierno de Figueroa ◽  
◽  
◽  
Keyword(s):  
North Africa ◽  
Evolutionary Rate ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Genetic Distances ◽  
Western Mediterranean ◽  
Similar Distribution ◽  
Undescribed Species ◽  
Vicariance Event ◽  
Definition Of

AbstractThe western Mediterranean stonefly genus Tyrrhenoleuctra traditionally includes 3 species: T. minuta (Spain, North Africa, Balearic Islands), T. tangerina (Spain, North Africa), T. zavattarii (Corsica and Sardinia). Since the traditional morphological characters display great and overlapping variation, allozyme electrophoresis was used to clarify taxonomic and phylogenetic relationships within the genus and to discuss biogeographical implications. The results clearly discriminate at least four entities: the Corso-Sardinian unit, for which the name T. zavattarii can be used; the Balearic population, representing an undescribed species; at least two Iberian peninsular species. However, more data on topotypic populations are needed to define the taxonomic status of the Iberian species (including definition of the currently used names T. minuta and T. tangerina). The presence of Tyrrhenoleuctra in Sardinia and Corsica is likely due to an old vicariance event following separation of the Sardinia-Corsica microplate from the Iberian Peninsula. Calibration of the molecular clock (genetic distances vs. Corso-Sardinian plate split from Iberia) resulted in a very low evolutionary rate (0.008 D/my), lower than those found in taxonomically distant groups (including stoneflies) with similar distribution.

scholarly journals An assessment of the taxonomic validity of three species of marsupial frogs (Anura: Hemiphractidae: Gastrotheca) from the Yungas of Bolivia based on external morphology and cranial osteology

Zootaxa ◽  
2021 ◽  
Vol 5068 (2) ◽  
pp. 211-239
Author(s):  
CLAUDIA LANSAC ◽  
RODRIGO AGUAYO ◽  
IGNACIO DE LA RIVA
Keyword(s):  
Principal Component ◽  
Taxonomic Status ◽  
Ct Scanning ◽  
Developmental State ◽  
Morphological Characters ◽  
Biological Entity ◽  
Nominal Species ◽  
Linear Discriminant ◽  
Morphological Studies ◽  
Cranial Osteology

The genus Gastrotheca (Anura: Hemiphractidae) is a group of marsupial frogs particularly diverse in Andean regions. Several taxonomic studies of this genus have been conducted in the humid cloud forests—or Yungas—of the Andean eastern slopes of central Bolivia (departments of Cochabamba and Santa Cruz). Yet, the distinction among three species that occur sympatrically in these forests, G. lauzuricae (proposed as a junior synonym of G. coeruleomaculatus in 2015), G. piperata, and G. splendens, remains unclear since the morphological characters that purportedly support their differentiation are variable and partly shared among them. We have carried out external morphological studies, including multivariate morphometric analyses, to assess how they support the taxonomic status of these three species. We also evaluated characters of the cranial osteology of a sample of six individuals using micro CT-scanning. Principal component and linear discriminant analyses resulted in a great overlap among the putative species. Cranial osteological comparisons did not reveal highly significant differences among them, but suggested that different degrees of hyperossification could be related to the developmental state of individuals. Our results indicate that most morphological and osteological reported differences between the three species likely represent intraspecific variation. Thus, we propose that the three nominal species belong to a single biological entity, for which the name Gastrotheca splendens (Schmidt, 1857) has priority. We also restrict the name Gastrotheca coeruleomaculatus (Werner, 1899) to externally similar congeneric populations from the Yungas forests of department of La Paz, but highlighting the need of a detailed evaluation of their taxonomic identity.  

scholarly journals Morphometry and Phylogeny of the Different Populations of Selaginella tamariscina (P. Beauv.) Spring and S. pulvinata (Hook. & Grev.) Maxim. in Northern Thailand

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
Udon Pongkawong ◽  
◽  
Jatupol Kampuansai ◽  
Rossarin Pollawatn ◽  
Arunothai Jampeetong ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Southern China ◽  
Phylogenetic Analyses ◽  
Dna Barcode ◽  
Morphological Characteristics ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
The Philippines ◽  
Northern Thailand ◽  
Selaginella Tamariscina

Abstract “Dok Hin” is the Thai local name for Selaginella species that form rosettes. They commonly distributes in Siberia, Manchuria, southern China, Japan, the Philippines and Thailand. Morphology of Dok Hin is very resemble leading to misidentification. So, exactly number of species of Dok Hin in Thailand and their differences in morphological characteristics is not well understood. Thus, revision of morphological characters and phylogenetic confirmation of the taxonomic identification are needed. This study aims to examine morphological charateristics and phylogenetic patterns in eight populations of the Dok Hin in Northern Thailand. Morphology of Dok Hin from each populations was quantitatively examined using 15 vegetative and 6 reproductive characters meanwhile phylogenetic analyses was explored by DNA barcode ITS2. The results of the phylogenetic analysis revealed the existence of two species of Dok Hin, S. tamariscina and S. pulvinata. Selaginella tamariscina can be distinguished from S. pulvinata by its presence of a pseudotrunk above ground and ridges of dorsal leaves. On the other hand, the results of phylogenetic analysis indicated the differences among populations of S. pulvinata as well. Chiang Mai populations of S. pulvinata was characterized by peculiar set of characters long leaves and leaf apices look like caudate, while the rest of their populations have shorter leaves and leaf apices look like aristate. It indicates that S. pulvinata has genetic and phenotypic divergence among populations. However, additional studies of Dok Hin populations in other parts of Thailand and studies on different genetic markers are necessary to confirm the taxonomic status of S. pulvinata. Keywords: Dok Hin, Morphometric, Phylogeny, Pseudotrunk, Resurrection plant

scholarly journals Plantago campestris (Plantaginaceae), a rare new species from southern Brazil, supported by phylogenomic and morphological evidence

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11848
Author(s):  
Gustavo Hassemer ◽  
Elliot M. Gardner ◽  
Nina Rønsted
Keyword(s):  
New Species ◽  
Species Complex ◽  
High Throughput Sequencing ◽  
Morphological Characters ◽  
High Elevation ◽  
Species Level ◽  
Morphological Evidence ◽  
Southern Brazil ◽  
A New Species ◽  
Iucn Criteria

High-throughput sequencing, when combined with taxonomic expertise, is a powerful tool to refine and advance taxonomic classification, including at the species level. In the present work, a new species, Plantago campestris, is described out of the P. commersoniana species complex, based on phylogenomic and morphological evidence. The main morphological characters that distinguish the new species from P. commersoniana are the glabrous posterior sepals and the slightly broader leaves. The new species is known from only three localities, all in natural high-elevation grasslands in Paraná and Santa Catarina states, southern Brazil. According to the IUCN criteria new species should be assessed as Endangered (EN). We present field photographs of P. campestris and related species, and we provide an identification key to the species previously included within the circumscription of P. commersoniana.

scholarly journals Unravelling the Potamonautes lirrangensis (Rathbun, 1904) species complex (Potamoidea: Potamonautidae), with the description of two new species

2021 ◽  
Vol 744 ◽  
Author(s):  
Neil Cumberlidge ◽  
Emily Johnson ◽  
Paul F. Clark ◽  
Martin J. Genner
Keyword(s):  
Species Complex ◽  
Central Africa ◽  
Taxonomic Status ◽  
Lake Malawi ◽  
Molecular Evidence ◽  
Similar Species ◽  
Freshwater Crab ◽  
Distribution Maps ◽  
Congo River ◽  
Two New Species

The taxonomic status of the widely distributed freshwater crab Potamonautes lirrangensis (Rathbun, 1904) sensu lato is revised because morphological and molecular evidence indicates that this taxon is a complex comprising more than one species. Four taxa are now recognized: Potamonautes lirrangensis (Rathbun, 1904) s. str. and P. kisangani sp. nov. from the Middle Congo River in Central Africa, P. amosae sp. nov. from the drainages of Lakes Kivu and Tanganyika, and P. orbitospinus (Cunnington, 1907) from Lake Malawi which had been previously synonymised with P. lirrangensis s. lat. Diagnoses, illustrations and distribution maps are provided for each of these taxa and they are compared to similar species from Central and Southern Africa.

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